Defining `MyType = 3 | "foo" | false` needs the language to allow arbitrary type changes of a variable, and while that's possible in JS it's generally not considered a good idea.
Rust forces you to define a single enum to represent this, and then you can implement the TryFrom trait to make it directly comparable to booleans, integers etc, but without having to deal with random `undefined` values popping up everywhere.
Is it less convenient? Yes, but so are seatbelts. Sometimes you need to build software where this tradeoff is worth it.
Rust forces you to define a single enum to represent this, and then you can implement the TryFrom trait to make it directly comparable to booleans, integers etc, but without having to deal with random `undefined` values popping up everywhere.
Is it less convenient? Yes, but so are seatbelts. Sometimes you need to build software where this tradeoff is worth it.